Load Capacity Calculator

STRUCTURAL

Beam · Column · Bending · Buckling · Safety factor

σ = M/Z P_cr = π²EI/(KL)²

Material

—

Cross-section

shape

Width / diam.

Height

Span length (L)

Support type

—

Load type

—

Safety factor

                            Max allowable load
                            —
                            kN
                        

Bending stress — MPa

Max deflection — mm

Section modulus (Z) — cm³

σ = M / Z | P = 4·M / L (simple point)

Load capacity decreases with span

Simply supported beam with center point load

Material

—

Cross-section

shape

Width / diam.

Height

Column height (L)

End conditions

—

Safety factor

                            Critical load (Pcr)
                            —
                            kN
                        

                            Allowable load
                            —
                            kN
                        

Slenderness ratio (λ) — —

Radius of gyration (r) — mm

P_cr = π² × E × I / (K × L)²

_cr ↓ P_cr

Buckling load decreases with height²

Euler buckling — first mode

Material	Yield strength (MPa)	E modulus (GPa)	Density (kg/m³)	Typical use
Steel (A36)	250	200	7850	Structural beams
Aluminum (6061)	240	69	2700	Lightweight structures
Wood (Douglas Fir)	55	13	550	Timber framing
Concrete (C30)	30	30	2400	Compression members
Stainless Steel	310	193	8000	Corrosion-resistant
Brass (C260)	200	110	8500	Machined parts

σ_allow = σ_yield / SF | I = ∫ y² dA